Our expert says:
Yes, muscle does weigh more than fat and also when you start exercising regularly, your blood volume can increase by up to a litre. I strongly recommend that you focus more on your body measurements rather than the scale, which actually gives you VERY LIMITED information. Every day, your weight can vary by up to 1 - 2kg!
Keep up the regular exercise - since this is a great option. Regarding your knees, I strongly recommend you see a sports physician to see why they are "bad?" It depends what is actually wrong with them and how the problem can be sorted out. Not dealing with the problem could worsen it considerably.
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